RISC-V processors have come a long way since their inception in 2010. Once thought to be significantly slower than the x86 and ARM counterparts, RISC-V processors like the new U84 from SiFive prove that this architecture is catching up very quickly and could become competitive in a few years.
https://www.notebookcheck.net/SiFive-readies-U8-Series-RISC-V-core-designs-to-compete-with-ARM-s-Cortex-A72-models.440633.0.html
Seeing these numbers I had to go look into their slides, and judging from the only slide with a bar chart, their phrasing of "boosts performance by 3.1 times" should be clarified to be "3.1 times the performance", similarly "2.3 times increased instruction-per-clock" should be "2.3 times the IPC", "1.4 times higher frequencies" is rather "40% higher frequencies", and "1.5 times better performance per Watt" is also probably "50% better performance per Watt".